Abstract: A method for producing a sandwich metal part (1) having a non-developable shape. The part including a metal honeycomb core (2) and two metal skins (4) arranged to either side of the core. The method including: a step of plastically deforming metal sheets (4?) for obtaining the two metal skins (4); then, a step of rigidly connecting the two metal skins (4) to the core (2).